package itxx.itxx;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class ServerDemo4 extends HttpServlet {
    /*
     *
     * 线程安全问题
     *
     *
     */
//1.定义一个用户名变量
    private String username;
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //解决1.定义在doGet或者doPost方法中
       // String username=null;
        //解决2.同步代码
       // synchronized (this){}
        //2.获取用户名
       req.getParameter("username");

        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        //3.将用户名响应给浏览器
        PrintWriter pw = resp.getWriter();
        pw.println("welcome"+ username);
        pw.close();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }

}
